diff --git a/O/OpenFHE_int128/README.md b/O/OpenFHE_int128/README.md
new file mode 100644
index 00000000000..d3ba04e3895
--- /dev/null
+++ b/O/OpenFHE_int128/README.md
@@ -0,0 +1,9 @@
+The OpenFHE library works with both 64-bit and 128-bit integers.
+
+This package builds the 128-bit version.
+
+To build the default 64-bit version, use [OpenFHE](https://github.com/JuliaPackaging/Yggdrasil/tree/master/O/OpenFHE).
+
+Most of the build steps for [OpenFHE](https://github.com/JuliaPackaging/Yggdrasil/tree/master/O/OpenFHE)
+and OpenFHE_int128 are the same, so the shared parts are in the
+[../OpenFHE/common.jl](https://github.com/JuliaPackaging/Yggdrasil/tree/master/O/OpenFHE/common.jl) script.
\ No newline at end of file
diff --git a/O/OpenFHE_int128/build_tarballs.jl b/O/OpenFHE_int128/build_tarballs.jl
new file mode 100644
index 00000000000..534dca0f3fb
--- /dev/null
+++ b/O/OpenFHE_int128/build_tarballs.jl
@@ -0,0 +1,15 @@
+# Note that this script can accept some limited command-line arguments, run
+# `julia build_tarballs.jl --help` to see a usage message.
+include(joinpath(pwd(), "..", "OpenFHE", "common.jl"))
+
+# If you make changes in this file, e.g., to release a new version,
+# be sure to also release a new version of `OpenFHE` as well (see `../OpenFHE/build_tarballs.jl`)
+name = "OpenFHE_int128"
+version = v"1.2.3"
+
+git_hash = "7b8346f4eac27121543e36c17237b919e03ec058"
+
+sources, script, platforms, products, dependencies = prepare_openfhe_build(name, git_hash)
+
+# Build the tarballs, and possibly a `build.jl` as well.
+build_tarballs(ARGS, name, version, sources, script, platforms, products, dependencies; julia_compat="1.6", preferred_gcc_version = v"10.2.0")